Periodic Inventory by Three Methods

The units of an item available for sale during the year were as follows:

Date Line Item Description Units and Cost

Jan. $1$ Inventory $6$ units at $$39$

Feb. $17$ Purchase $8$ units at $$40$

Jul. $21$ Purchase $9$ units at $$41$

Nov. $23$ Purchase $11$ units at $$41$

There are $6$ units of the item in the physical inventory at December $31.$ The periodic inventory system is used.

a$.$ Determine the inventory cost by the first$-$in$,$ first$-$out method.

b$.$ Determine the inventory cost by the last$-$in$,$ first$-$out method.

c$.$ Determine the inventory cost by the weighted average cost method. Round average unit cost to the two decimal places, and round your final answer to the nearest dollar.